What does this symbol mean in the Starcraft chat portrait?

What does this symbol mean in the Starcraft chat portrait? - Young lady learning sign language during online lesson with female tutor

What is the little symbol in corner of the portrait, in Starcraft 2's list of friends?

starcraft-2

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What does this symbol mean in the Starcraft chat portrait? - Young female friends communicating using sign language in library

What does this symbol mean in the Starcraft chat portrait? - Side view of female friends sitting at table in university library and using sign language

What does this symbol mean in the Starcraft chat portrait? - Crop anonymous lady in elegant blazers sitting in comfortable armchair and showing index finger while communicating using sign language

Who is the Phantom? Playing UMS with Guys in Chat

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